Update README.md

Author: vismodo

README.md

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 # Python-Quiz-Application
 This repository will help you run a cross-platform quiz software with python 3 which can be used for assessments and tests in the time of isolation.
 ## Demonstration:
-[![Demo CountPages alpha](https://share.gifyoutube.com/KzB6Gb.gif)](https://www.youtube.com/watch?v=ek1j272iAmc)
+[<img src="https://github.com/VismayaAtreya/Python-Quiz-Application/blob/master/Greet.jpg" width="50%">](https://youtu.be/<VIDEO ID>)
 ## Getting Started
 1. Clone the repository and extract the '.zip' file and keep all its contents in the same folder.